CN107948542A - Multi-cam exposure control method and device - Google Patents
Multi-cam exposure control method and device Download PDFInfo
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- CN107948542A CN107948542A CN201810037086.3A CN201810037086A CN107948542A CN 107948542 A CN107948542 A CN 107948542A CN 201810037086 A CN201810037086 A CN 201810037086A CN 107948542 A CN107948542 A CN 107948542A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/73—Circuitry for compensating brightness variation in the scene by influencing the exposure time
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Abstract
The invention discloses a kind of multi-cam exposure control method and device, method includes：Obtain the exposure characteristics data of each camera in multiple cameras, the relation between the exposure time and brightness of image of the exposure characteristics data reflection camera；Based on the exposure characteristics data, it is the first brightness Y to calculate in the multiple camera each camera in brightness of imagepreWhen renewal prior exposure duration；As the required object brightness Y reachedtargetWith the first brightness YpreWhen inconsistent, the object brightness Y is calculatedtargetWith the first brightness YpreRatio R atio；Based on the ratio R atio and the exposure characteristics data, calculate renewal post-exposure duration of each camera when brightness of image is the object brightness in the multiple camera, to control the multiple camera based on the renewal post-exposure duration so that the picture of camera output has relatively good uniformity.
Description
Technical field
The invention belongs to technical field of image processing, more particularly to a kind of multi-cam exposure control method and device.
Background technology
As the application of multi-cam is more and more extensive (such as mobile phone, panorama camera, 3D shootings, binocular body-sensing etc.), for
The spectrum assignment of multi-cam requires higher and higher.Taken the photograph in application more, be not generally that each camera of requirement individually exports
Picture average brightness it is consistent, but need under identical object or scene, the brightness of each camera output is consistent.Pass
The spectrum assignment mode of system individually controls for each camera, the brightness of each camera image is analyzed respectively, then according to figure
Image brightness adjusts sensor exposure time respectively.
Traditional method individually controlled is in the case where picture field angle is inconsistent, since the brightness of statistics is in the presence of poor
It is different, after automatic exposure brightness can there are certain difference.
The content of the invention
The present invention be directed to problems of the prior art, and it is an object of the present invention to provide a kind of multi-cam exposure control method and
Device.
In an embodiment of the present invention, a kind of multi-cam exposure control method includes：
The exposure characteristics data of each camera in multiple cameras are obtained, the exposure characteristics data reflection camera
Relation between exposure time and brightness of image；
Based on the exposure characteristics data, it is first to calculate in the multiple camera each camera in brightness of image
Brightness YpreWhen renewal prior exposure duration；
As the required object brightness Y reachedtargetWith the first brightness YpreWhen inconsistent, the object brightness is calculated
YtargetWith the first brightness YpreRatio R atio；
Based on the ratio R atio and the exposure characteristics data, calculate each camera in the multiple camera and exist
Renewal post-exposure duration when brightness of image is the object brightness, it is described to be controlled based on the renewal post-exposure duration
Multiple cameras.
In an embodiment of the present invention, a kind of multi-cam exposure control device includes：
Acquiring unit, for obtaining the exposure characteristics data of each camera in multiple cameras, the exposure characteristics number
According to the relation between the exposure time and brightness of image of reflection camera；
First computing unit, for based on the exposure characteristics data, calculating each camera in the multiple camera
It is the first brightness Y in brightness of imagepreWhen renewal prior exposure duration；
Second computing unit, for as the required object brightness Y reachedtargetWith the first brightness YpreWhen inconsistent,
Calculate the object brightness YtargetWith the first brightness YpreRatio R atio；
3rd computing unit, for based on the ratio R atio and the exposure characteristics data, calculating the multiple shooting
Renewal post-exposure duration of each camera when brightness of image is the object brightness in head, with based on being exposed after the renewal
Light time is grown to control the multiple camera.
Effect of the invention is that：
It is then special according to the exposure of each camera by obtaining the exposure characteristics of each camera in multi-cam in advance
Property, exposure time of each camera when brightness is relatively uniform is calculated respectively so that all cameras are in same object
Brightness it is consistent, reach camera output picture have relatively good uniformity.
It is described further below with reference to the technique effect of design of the attached drawing to the present invention, concrete structure and generation, with
It is fully understood from the purpose of the present invention, feature and effect.
Brief description of the drawings
Fig. 1 is the flow chart for the acquisition multi-cam exposure characteristics that one embodiment of the invention provides；
Fig. 2 is the exposure characteristics figure of camera；
Fig. 3 is the flow chart for the multi-cam exposure control method that one embodiment of the invention provides；
Fig. 4 is the module map for the multi-cam exposure control device that one embodiment of the invention provides.
Embodiment
In order to make those skilled in the art more fully understand the technical solution in this specification embodiment, below in conjunction with this
Attached drawing in specification embodiment, is described in detail the technical solution in this specification embodiment, it is clear that described
Embodiment is only the part of the embodiment of this specification, instead of all the embodiments.Based on the embodiment in this specification,
Those of ordinary skill in the art's all other embodiments obtained, should all belong to the scope of protection.
Technical scheme includes the calibration of camera module exposure characteristics and two parts of spectrum assignment.Wherein,
" exposure characteristics calibration " refers to：Because the difference of the factors such as sensor model number, module group lens, assembling, the exposure of each camera module
Light characteristic can be there are certain difference, and therefore, in spectrum assignment, it is necessary to exclude the otherness of individual, the embodiment of the present invention is adopted
Method needs to demarcate the exposure characteristics of each camera in camera module one by one.
The scaling method of camera module exposure characteristics is first introduced herein, as shown in Figure 1, being provided for one embodiment of the invention
Acquisition multi-cam exposure characteristics flow, including step 101~103, wherein：
Step 101：In completely black darkroom, each camera in the multiple camera is respectively aligned to constant homogeneous light
Source, obtains each camera in the brightness of image obtained by different exposure times and is recorded.
Step 102：Brightness of image according to obtained by each camera of record in different exposure times, calculates each shooting respectively
The exposure characteristics data of head.
Wherein, as shown in Fig. 2, the formula of the exposure characteristics for reflecting the camera is：
Y=K*EXPOSURE+BLC；
Wherein, EXPOSURE represents exposure time, and BLC is initial luma values, and K is slope, and Y is brightness of image；
The exposure characteristics data include the slope K and the initial luma values BLC.
Step 103：Slope K and BLC values are burnt in memory element.
Wherein it is possible to the exposure characteristics of each camera in multiple cameras is calculated respectively：
Y1=K1*EXPOSURE+BLC1
Y2=K2*EXPOSURE+BLC2
……
Yn=Kn*EXPOSURE+BLCn。
Finally, by above-mentioned K1、K2……Kn, BLC1、BLC2……BLCnIt is burnt to memory element in camera module (such as
EEPROM)。
As shown in figure 3, a kind of multi-cam exposure control method provided in one embodiment of the invention, including step 201
~205, wherein：
Step 201：Read the exposure characteristics data of each camera in multiple cameras, the exposure characteristics data reflection
Relation between the exposure time and brightness of image of camera.
Step 202：Based on the exposure characteristics data, each camera is calculated in the multiple camera in brightness of image
It is the first brightness YpreWhen renewal prior exposure duration.
Optionally, the first brightness YpreCan be the main camera in the multiple camera or all cameras institute
The brightness of image of output.
In spectrum assignment, if the scene of camera is consistent, it is necessary to which the brightness of each camera is consistent, than this scene
It is dark, then need scene darker than the output of this scene, brighter than this scene, opposite bright of output picture.In the present invention
Referred to as expose relatively uniform, it shows as equation below：
Y1=Y2...=Yn(formula one)；
Wherein, Y1It is the output brightness of the 1st camera, Y2It is the output brightness ... of the 2nd camera, YnIt is n-th
The output brightness of camera.
Based on exposure characteristics data, above-mentioned formula one can be converted into：
K1*EXPOSURE1+BLC1=K2*EXPOSURE2+BLC2=Kn*EXPOSUREn+BLCn(formula two).
It is it is assumed that a length of during the initial exposure of the 1st camera：EXPOSURE0And on the basis of the 1st camera, then root
It is a length of when can be calculated the initial exposure of the 2nd camera according to above-mentioned formula two：
(K1*EXPOSURE0+BLC1-BLC2)/K2；
……
And so on, when initial exposure of n-th camera, is a length of：
(K1*EXPOSURE0+BLC1-BLCn)/Kn。
Wherein the first brightness Ypre=K1*EXPOSURE0+BLC1。
Step 203：When needing to carry out single exposure control (such as scene changes or receive exposure instruction), it is thus necessary to determine that
It is currently needed for the object brightness reached, and more above-mentioned first brightness (i.e. Ypre) whether consistent with current object brightness, if
It is consistent then need not be calculated and step 205) (is directly directly entered, such as using the exposure time of each camera before the update
Fruit is inconsistent, then needs to be recalculated and (enter step 204).
Step 204：Calculate the object brightness YtargetWith the first brightness YpreRatio R atio (i.e. Ytarget=
Ypre* Ratio), and the ratio R atio and the exposure characteristics data are based on, calculate each shooting in the multiple camera
Renewal post-exposure duration of the head when brightness of image is the object brightness.
The renewal post-exposure duration EXPOSURE1 of the 1st camera calculatedtarget=Ratio*EXPOSURE1pre+
(Ratio-1)*BLC1/K1, wherein, EXPOSURE1pre(exposed for the renewal prior exposure duration of the 1st camera if first time
Photocontrol, this value are EXPOSURE0, if it is not, then the exposure value obtained by the end of for last time spectrum assignment), BLC1For the 1st
The initial luma values of a camera, K1For the slope of the 1st camera；
The renewal post-exposure duration EXPOSURE2 of the 2nd camera calculatedtarget=Ratio* ((K1*
EXPOSURE1pre+BLC1-BLC2)/K2)+(Ratio-1)*BLC2/K2, wherein, BLC2For the original intensity of the 2nd camera
Value, K2For the slope of the 2nd camera；
……
And so on, the renewal post-exposure duration EXPOSUREn of n-th of the camera calculatedtarget=Ratio*
((K1*EXPOSURE1pre+BLC1-BLCn)/Kn)+(Ratio-1)*BLCn/Kn, wherein, BLCnFor the initial of n-th camera
Brightness value, KnFor the slope of n-th of camera.
In one embodiment of the invention, the method further includes：The renewal post-exposure duration is recorded, using as exposing next time
The renewal prior exposure duration of photocontrol instruction.Optionally, the renewal can be recorded in module (such as CPU) in realizing for this algorithm
Post-exposure duration.
Step 205：The multiple camera is controlled based on renewal post-exposure duration, and is waited after control next
Secondary exposure.The present invention needs the renewal post-exposure duration of each camera being respectively written into camera so that camera module
In the relatively uniform state of exposure.Then exposure instruction next time is waited, or spectrum assignment is automatically turned on according to scene changes.
Wherein, the current exposure exposed next time is the exposure value of this end exposure.
It is characteristic of the invention that the exposure characteristics based on each camera sets out, other external field angles, parallax have been abandoned
Etc. factor.And module is demarcated, eliminates module individual difference, all cameras are consistent in same scene brightness, reach
To preferable coherence request., can be according to specific spectrum assignment, to taking the photograph and the visual field angular difference of camera does not require
As the number of head does not also require.Using than wide.The scope of application of the present invention includes but is not limited to：Mobile phone, panorama phase
Machine, 3D modeling, 3D rangings etc..
Correspondingly, the embodiment of the present invention, which additionally provides a kind of multi-cam exposure control device, (can pass through software mode
Realize), as shown in figure 4, the device can include：
Acquiring unit 301, for obtaining the exposure characteristics data of each camera in multiple cameras, the exposure characteristics
Relation between the exposure time and brightness of image of data reflection camera；
First computing unit 302, for based on the exposure characteristics data, calculating each shooting in the multiple camera
Head is the first brightness Y in brightness of imagepreWhen renewal prior exposure duration；
Second computing unit 303, for as the required object brightness Y reachedtargetWith the first brightness YpreIt is inconsistent
When, calculate the object brightness YtargetWith the first brightness YpreRatio R atio；
3rd computing unit 304, for based on the ratio R atio and the exposure characteristics data, calculating the multiple
Renewal post-exposure duration of each camera when brightness of image is the object brightness in camera, with based on the renewal
Post-exposure duration controls the multiple camera.
Optionally, described device further includes：
Exposure characteristics computing unit, it is in completely black darkroom, each camera in the multiple camera is right respectively
Quasi- constant homogeneous light source, obtains each camera in the brightness of image obtained by different exposure times, and according to each camera in difference
Brightness of image obtained by exposure time, calculates the exposure characteristics data of each camera respectively.
The function of modules and effect realizes that process specifically refers to step is corresponded in the above method in above device
Realize process, details are not described herein.
As seen through the above description of the embodiments, those skilled in the art can be understood that this specification
Embodiment can add the mode of required general hardware platform to realize by software.Based on such understanding, this specification is implemented
The part that the technical solution of example substantially in other words contributes the prior art can be embodied in the form of software product,
The computer software product can be stored in storage medium, such as ROM/RAM, magnetic disc, CD, including some instructions are making
It is each to obtain computer equipment (can be personal computer, server, or network equipment etc.) execution this specification embodiment
Method described in some parts of a embodiment or embodiment.
System, device, module or the unit that above-described embodiment illustrates, can specifically be realized by computer chip or entity,
Or realized by having the function of certain product.One kind typically realizes that equipment is computer, and the concrete form of computer can
To be personal computer, laptop computer, cell phone, camera phone, smart phone, personal digital assistant, media play
In device, navigation equipment, E-mail receiver/send equipment, game console, tablet PC, wearable device or these equipment
The combination of any several equipment.
Each embodiment in this specification is described by the way of progressive, identical similar portion between each embodiment
Divide mutually referring to what each embodiment stressed is the difference with other embodiment.It is real especially for device
For applying example, since it is substantially similar to embodiment of the method, so describing fairly simple, related part is referring to embodiment of the method
Part explanation.Device embodiment described above is only schematical, wherein described be used as separating component explanation
Module may or may not be it is physically separate, can be each module when implementing this specification embodiment scheme
Function realized in same or multiple softwares and/or hardware.Can also select according to the actual needs part therein or
Person's whole module realizes the purpose of this embodiment scheme.Those of ordinary skill in the art are in situation about not making the creative labor
Under, you can to understand and implement.
The above is only the embodiment of this specification embodiment, it is noted that for the general of the art
For logical technical staff, on the premise of this specification embodiment principle is not departed from, some improvements and modifications can also be made, this
A little improvements and modifications also should be regarded as the protection domain of this specification embodiment.
Claims (10)
- A kind of 1. multi-cam exposure control method, it is characterised in that including：Obtain the exposure characteristics data of each camera in multiple cameras, the exposure of the exposure characteristics data reflection camera Relation between duration and brightness of image；Based on the exposure characteristics data, it is the first brightness to calculate in the multiple camera each camera in brightness of image YpreWhen renewal prior exposure duration；As the required object brightness Y reachedtargetWith the first brightness YpreWhen inconsistent, the object brightness Y is calculatedtarget With the first brightness YpreRatio R atio；Based on the ratio R atio and the exposure characteristics data, each camera is calculated in the multiple camera in image Renewal post-exposure duration when brightness is the object brightness, with the multiple to control based on the renewal post-exposure duration Camera.
- 2. the method as described in claim 1, it is characterised in that the method further includes：In completely black darkroom, each camera in the multiple camera is respectively aligned to constant homogeneous light source, obtains each shooting Head is in the brightness of image obtained by different exposure times；Brightness of image according to obtained by each camera in different exposure times, calculates the exposure characteristics data of each camera respectively.
- 3. method as claimed in claim 2, it is characterised in that the formula of exposure characteristics for reflecting the camera is：Y=K*EXPOSURE+BLC；Wherein, EXPOSURE represents exposure time, and BLC is initial luma values, and K is slope, and Y is brightness of image；The exposure characteristics data include the slope K and the initial luma values BLC.
- 4. the method as described in claim 1, it is characterised in that the method further includes：The renewal post-exposure duration is recorded, using the renewal prior exposure duration instructed as spectrum assignment next time.
- 5. the method as described in claim 1, it is characterised in that first brightness is the main shooting in the multiple camera The brightness of image that head or all cameras are exported.
- 6. the method as described in claim 1, it is characterised in that the renewal post-exposure duration of the 1st camera calculated EXPOSURE1target=Ratio*EXPOSURE1pre+(Ratio-1)*BLC1/K1, wherein, EXPOSURE1preFor the 1st shooting The renewal prior exposure duration of head, BLC1For the initial luma values of the 1st camera, K1For the slope of the 1st camera；The renewal post-exposure duration EXPOSURE2 of the 2nd camera calculatedtarget=Ratio* ((K1*EXPOSURE1pre+ BLC1-BLC2)/K2)+(Ratio-1)*BLC2/K2, wherein, BLC2For the initial luma values of the 2nd camera, K2Taken the photograph for the 2nd As the slope of head；And so on, the renewal post-exposure duration EXPOSUREn of n-th of the camera calculatedtarget=Ratio* ((K1* EXPOSURE1pre+BLC1-BLCn)/Kn)+(Ratio-1)*BLCn/Kn, wherein, BLCnFor the original intensity of n-th of camera Value, KnFor the slope of n-th of camera.
- A kind of 7. multi-cam exposure control device, it is characterised in that including：Acquiring unit, for obtaining the exposure characteristics data of each camera in multiple cameras, the exposure characteristics data are anti- Reflect the relation between the exposure time of camera and brightness of image；First computing unit, for based on the exposure characteristics data, calculating each camera in the multiple camera and scheming Image brightness is the first brightness YpreWhen renewal prior exposure duration；Second computing unit, for as the required object brightness Y reachedtargetWith the first brightness YpreWhen inconsistent, calculate The object brightness YtargetWith the first brightness YpreRatio R atio；3rd computing unit, for based on the ratio R atio and the exposure characteristics data, calculating in the multiple camera Renewal post-exposure duration of each camera when brightness of image is the object brightness, with based on it is described renewal post-exposure when Grow to control the multiple camera.
- 8. device as claimed in claim 7, it is characterised in that described device further includes：Exposure characteristics computing unit, in completely black darkroom, each camera in the multiple camera to be respectively aligned to perseverance Determine uniform source of light, obtain each camera in the brightness of image obtained by different exposure times, and according to each camera in different exposures Brightness of image obtained by duration, calculates the exposure characteristics data of each camera respectively.
- 9. device as claimed in claim 8, it is characterised in that the formula of exposure characteristics for reflecting the camera is：Y=K*EXPOSURE+BLC；Wherein, EXPOSURE represents exposure time, and BLC is initial luma values, and K is slope, and Y is brightness of image；The exposure characteristics data include the slope K and the initial luma values BLC.
- 10. device as claimed in claim 7, it is characterised in that the 1st camera that the 3rd computing unit calculates Update post-exposure durationEXPOSURE1target=Ratio*EXPOSURE1pre+(Ratio-1)*BLC1/K1, wherein, EXPOSURE1preFor the 1st The renewal prior exposure duration of camera, BLC1For the initial luma values of the 1st camera, K1For the slope of the 1st camera；The renewal post-exposure duration EXPOSURE2 for the 2nd camera that 3rd computing unit calculatestarget=Ratio* ((K1*EXPOSURE1pre+BLC1-BLC2)/K2)+(Ratio-1)*BLC2/K2, wherein, BLC2For the initial of the 2nd camera Brightness value, K2For the slope of the 2nd camera；And so on, the renewal post-exposure duration EXPOSUREn for n-th of camera that the 3rd computing unit calculatestarget=Ratio* ((K1*EXPOSURE1pre+BLC1-BLCn)/Kn)+(Ratio-1)*BLCn/Kn, wherein, BLCnFor n-th The initial luma values of camera, KnFor the slope of n-th of camera.
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| CN108777769A (en) * | 2018-05-31 | 2018-11-09 | 歌尔股份有限公司 | camera exposure time adjusting method, device and equipment |
| CN110049257A (en) * | 2019-05-31 | 2019-07-23 | 深圳岚锋创视网络科技有限公司 | The method and electronic device of a kind of synchronous exposure parameter of determination half |
| CN111684789A (en) * | 2019-06-10 | 2020-09-18 | 深圳市大疆创新科技有限公司 | Image acquisition method, image acquisition device and unmanned aerial vehicle |
| CN114125314A (en) * | 2021-11-23 | 2022-03-01 | 展讯通信（上海）有限公司 | Brightness synchronization method, device, storage medium and equipment |
| CN115460355A (en) * | 2022-08-31 | 2022-12-09 | 青岛海信移动通信技术股份有限公司 | Image acquisition method and device |
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| CN114125314A (en) * | 2021-11-23 | 2022-03-01 | 展讯通信（上海）有限公司 | Brightness synchronization method, device, storage medium and equipment |
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Application publication date: 20180420 |